![background image](http://html2.mh-extra.com/html/navien/ncb-24ldwe/ncb-24ldwe_installation-and-operation-manual_3646868008.webp)
8 About the Boiler
2.3 Technical Data
The following table lists the general specifications for the boiler.
Specifications
Unit
NCB-24LDWE
NCB-28LDWE
NCB-34LDWE
NCB-40LDWE
Heat input range
kW
20.0/4.2
24.0/4.2
29.0/5.1
34.0/4.0
DHW heat input range
kW
24.0/4.2
28.0/4.2
34.0/5.1
40.0/4.0
Heat output range @ 80/60°C
kW
19.5/3.9
23.4/3.9
28.3/4.9
33.2/3.8
DHW output range
kW
23.8/4.1
27.7/4.1
33.7/5.0
39.6/3.9
Condensing heat output range @ 50/30°C
kW
21.4/4.5
25.6/4.5
31.1/5.4
36.3/4.3
Full load efficiency at Max./Min. output @ 80/60°C
%
97.5/96.4
97.5/96.4
97.6/96.4
97.6/95.8
Full load efficiency at Max./Min. output @ 50/30°C
(Condensing)
%
106.9/107.8
106.6/107.8
107.3/106.9
106.9/106.9
Partial load (30%) efficiency with 47°C return temp.
%
101.9
103.1
102.0
103.1
Partial load (30%) efficiency with 30°C return temp.
%
108.6
108.9
108.5
108.8
Heat loss through the case with burner switched on
%
0.1
0.1
0.1
0.1
Heat loss through the chimney with burner switched on
%
1.6
1.8
1.5
1.9
Seasonal efficiency rate (SEDBUK 2009)
-
89.0
89.1
89.0
89.1
NOx Classification
-
Class 5
Category
-
II2H3P
Type
-
Heating and instantaneous hot water production
Heat output adjustment
-
Adjustable over entire Max./Min. output range
Type of heating installation
-
Close circuit
Max. heating operation pressure
bar
2.5
Max. heating temperature
°C
90
Adjustable heating temperature range
°C
40-90
Expansion vessel volume
l
6.0
Expansion vessel pre-charged pressure
bar
1.0
Min. DHW working pressure
bar
1.0
1.2
1.4
1.4
Min. DHW working flow
l/min
2.0
Max. DHW working pressure
bar
10
Adjustable DHW temperature range
°C
30–65
DHW flow rate @ 25°C temp. rise.
l/min
13.8
16.1
19.5
22.9
DHW flow rate @ 30°C temp. rise.
l/min
11.5
13.4
16.2
19.1
DHW flow rate for kitchen @ 45°C temp. rise.
l/min
7.6
8.9
10.8
12.7
Electrical power supply
-
230 V/50 Hz
Nominal current
A
0.6
0.6
0.62
0.62
Max. power consumption
W
130
Appliance protection rating
-
IP X5D
Boiler mounting system type
-
Wall-mounted
Summary of Contents for NCB-24LDWE
Page 65: ...Appendices 65 12 4 Ladder Diagram 3 15A...
Page 69: ...Memo...
Page 70: ...Memo...
Page 71: ...Memo...